Sorry, I might misunderstand. When you say “broken links” or “dead links”, do you mean you don’t need those links or the bookmarks those links refer to no longer exist, and you want to get rid of them? What types of links are they? E.g., a file link refers to a file that does not exist anymore.
The majority are links which the target no longer exists between Agenda, Bear, OmniFocus and other data base type locations as well as web links which were created in those apps but no longer exist. A very small percentage are hook-file links.